The 507-page interim report, compiled by interviewing more than 400 people, including utility workers and government officials, found that authorities had grossly underestimated tsunami risks, assuming the highest wave would be six metres (20ft). The tsunami hit at more than double that level.
The report criticised the use of the term soteigai, meaning unforeseeable, which it said implied authorities were shirking responsibility for what had happened. It said by labelling the events as beyond what could have been expected, officials had invited public distrust.
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